Automatic guide-light for vessels.



J. H. HAMMOND, 1R. AUTOMATIC GUIDE L IGHT FOR VESSELS. APPLlcAnoN flLED AUG. 1-4, 1'913, nENEwED Nov. 11.1916.

Patented July so, 1918.

4 SHEETS-SHEET l INVENTOH v ATTRNEYS I. H.- HAMMOND, IR. AUTOMATIC GUIDE LIGHT FOR VESSELS. APPLICATION FILED AuG.14,1913, mmawen Nov. 17.1916.

1,274,265. Patented July 30, 1918.

l 4 SHEETS-SHEET 2.

WINESSES J. H. HAMMOND, In. AUTOMATIC GUIDE LIGHT FOR VESSELS. APPucAnoN FILED AUG.14,1 913. RENEWED Nov. 17,1916.

1 ,274,265. Patented July 30, 1918.

Y 4 SHEETS-SHEET 3.

WITNESSES INVENTO? l. H. HAMMOND, 1R.

AUTOMATIC GUIDELIGHT FOR vEssELs.

3. RENEWED NOV- 'l7, 1916.

MPLHJTION` HLED AUG. 14, VSH Patented July 30,1918.

/NvENroH WTNESSES: ATTORNEYS l Lafrance.

JOHN HAYS HAMMOND, JR., 0F' GLOUCESTER, MASSACHUSETTS.

AUTOMATIC GUIDE-LIGHT FOR VESSELS.

Application filed August 14, 1913, Serial No. 784,689.

To all 'whom t may concern: f 1

Beit known that I, JOHN HAYs Haar MoND, Jr., a. citizen of the United States, residing in Gloucester, in the State of Massachusetts, have invented certain new and usefull Improvements in Automatic Guide-Lights for'Vessels, of which the fol-- lowing is a specification.

My invention relates to guides and particularly lights which are used-to guide a vessel controlled from a distance, and relates more particularly to lights on floats or other vessels whichare towed by torpedoes, torpedo boats and similar craft controlled from a distance either by wire or by radiant energy. These lights are to be invisible to an enemy, but are to be visible to observers at the station, either on shore or on another vessel, lfrom which the movements of the said torpedoes or similar craft are conl trolled and directed.

tion involving the use of In the accompanying drawing, I have represented that embodiment of my invenguidelights, though I am not restricted thereto, the scope of the invention being pointed out in the claims.

In the accompanying drawings,

Figure l shows, partly in diagrammatic form, a warship and a torpedo with floats in tow.

Fig. 2 shows a torpedo with a guide-light and with lioats in tow.

Fig. 3 shows, partly in section, la mast, guide light, and mechanism on a torpedo or similar craft. i

Figs. 4 and 5 show, partly diagrammati cally, a switch or commutator and brushes on a torpedo and a fioat with a light.

Fig. 6 shows, partly diagrammatically, a warship and a torpedo with floats in tow having a modified form of lights. v

Fig. 7 shows, partly diagrammatically, mechanism on a torpedo, and a modified form of lights on iloats.

Fig. 7a shows an' end View of a mirror for a light on one of my floats.

Figs. 8 and 9 show, respectively, top and bottom views of a double commutator or switch on one o'f my torpedoes.

Fig. l0 shows, in diagrammatic form, radio receiving apparatus and other mecha nisms on a torpedo, and floats with lights.

Fi .4 1l shows a. side view of one form of my oats with lights.

Specification of Letters Patent.

l'atented July 30, 1918. Renewed November 17, 1916. Serial No. 131,958.

Fig. 12 shows an end view of such a fioat with lights. l

Fig. 13, shows, diagrammatically, a modi# lied form of my system of. towing guide lights.

In Fig. l, S is a shore station containing radio transmitting apparatus for controlling the movements of torpedoes or similar craft, W is a warship, T is a torpedo or similar craft controlled from the shore statlon and advancing toward the warship, with lioats F, F? and F* in tow. K is a guide lighton the torpedo, and L, L2 and L4 are guide lights on the floats. T is the same or a similar torpedo returning from the warship,'with the same or similar ioats F', and F5 in tow, and K is the. same or a similar guide light on torpedo T.`

.In Fig. 2, T is a. torpedo, 'or similar craft, with masts E and E', antenna A, and guide light K, and with a tow line or cable R R for towing the loats F and F 2 having guide lights L and L2, respectively.V

In Fig. 3, E is a'hollow mast on one of my torpedoes, or similar craft, Gr represents a casing adapted to contain a gyroscope and any well-known' mechanism controlled thereby, which mechanism is connected in any suitable manner with the bevel gearing The rotatable vertical rod or shaft D connects bevel gearing C with bevel gearing C', and the latter is connected bv means of suitable mechanisms with the guide light- K, so that the rays from light K are emitted constantly in one direction, as fully described in my application for U. S. Letters' PatentNo. 756,273. Attached to the mast E is a frame VV with openings or windows, within which light K revolves. Att-ached to the shaftD and turning with it is a switch or commutator U, having a rim composed partly of insulating material I and partly of conducting material J. Brush H, which is rigidly attached to the torpedobears on this rim.

In Figs. 4 and 5, U is a switch or commutator attached tothe shaft D on a torpedo and having a rim composed partly of insulating material I and partly of conducting material J. Brushes H and H', rigidly attached to the torpedo, bear on the riin of the commutator. A battery or other source of current, B, is connected by means of the insulated conductors X and Y, the brushes H and H and the commutator U with the guide light L onthe lloat F. The conductors X and Y are preferably carried by the towline or cable R shown in Fig. 2, or

' they may form part of said cable.

' away vIn Fig. 4, the brushes H and H are shown bearing on the conducting part J of the commutator, so that current flows from the battery or generator B through the lamp L. In Fig. 5, the brushes areshown bearing on the *insulating part I ofthe commutator, so that the lamp L. The

when

' direction, so that these guide lights will enablethe observer at the station S to direct the torpedo toward the warship, and if the warship should -be missed and the torpedo lhave to be brought back, or if for any other reason it should be necessary to turn the torpedo, these guide lights will go out and will not betray the presence of the torpedo to l ward light L.

the enemy.

In Fig. 6, is a shore station, containing radio transmitting apparatus for controlling the movements of torpedoes or'similar craft, W is a warship, T is a torpedo, or similar craft, controlledfrom vthe shore station and advancing toward the warship W, and towing floats F', F2 and F4. L, L2 and L4L are rear guide lights on the floats F, F2 and F4, respectively. T is the torpedo re turning toward the shore station, and F,

lF3 and F5 show the towed floats in-this new position, with forward guide lights L, L3 y and L5. A

In Fig. 7 E is a hollow mast on one of my torpedoes orvsimilar craft, G is a casing containing a` gyroscope and any well-known mechanism controlled thereby, which mechanismlis connected in any suitable manner with the bevel gearing C. The rotatable vertical rod or shaft D is attached to the vbevel gearing C, and al.. its upper end is lsuitably connected with agu'ide light which revolves inside the frame V, .which has.

openings or lwindows. Attached to the shaft D and turning with it is the double c ommutator or switch U having/an upper rim and a lower rim. The upper rim has an insulating part I and av conducting part J. yThe lower rim has an insulatinc part I 'anda conducting part J. Brushes H and H, which are rigidly attached to the torpedo, bear on the upper rim, and brushes H2 and H3, which are also rigidly attached to the torpedo, bear on the lower rim. F is a float connected by a towline R with the torpedo, and carrying the rear light L and the for- -N and N are lenses for concentrating and directing the rays from the lights Land L, respectively. M and M are mirrors, with reflecting surfaces on both sides, for the purposepf reflecting theV light from Land from L', respectively, in

such a way that if the float isA not moving in a direct line froni'or toward the controlling station, the observer there will still be ableA to see light L or light L. L2 and L3 are lamps on a second float','not shown, towed behind the first float F. A battery B onthe torpedo, is connected with the brushes H and H2, and, by means of the conductor X', with the lamps LLL, L2 and L3. The conductor Y is connectedwith brush H and with the lamps L Vand L3, andthe conductor Y is connected with the brishV H3 and with the lamps L and L2. The position of the switch -or commutator U is controlled by the gyroscope in casing G, and the position of the brushes with reference to the commutator will vary with directionY in which the torrpedo is pointing. The commutator is so* arranged, that when the torpedo is headed toward the warship W and away from the station S, in Fig. 6, brushes H2 and Hswill bear on the co'nducting part of the lower rim of the commutator, and brushes H and H will bear on the insulating part of the upper r'im of the commutator, so that rear lamps L and L2 will be lighted, and forward lamps'L and L3 will be out, and when the torpedo is headed away from the warship and toward the station, the reverse will take place, as/shown invFig. 7

In 7a M is an end view of the mirror, with reflecting` surfaces on both sides, shown in side view in Fig. 7. Mirror M is similar to M.

In Fig. 8, U is a switch or commutator, the upper rim of which is here shown, I being the insulating part of the rim, and J being the` conducting part .of the riin. and Hl are brushes and X and Y are conductors leading tov a battery and lamps, shown in Fig. 7. i

In Fig. 9, U is a switch'or con'unutator, the lower rim of which is here shown, I being the insulating part of the rim, and J being` the conducting part ofi-herrinl'. H2 and H2 are brushes, and X7 and Y are conductors leading to a battery and lamps,

' shown in Fig. 7

In Fig. 10, A is an antenna on the torpedo, grounded at 1 through an inductancecoil 2, which is'coupled witlithe tuned oscillatory circuit 3, 4, comprising the nductance coil 3l and 'the variable'condenserl. vBy means of a stopping condenser 5 and rectifier 6, current impulses'are supplied to the relay 7,

which, when actuated, allows current to flow fromthe battery B3 through the electro-V magnet 8. Then the electi'oinagnet S is energized, it causes commutator 13 to rotate by means of armature 9, rod l() and pawl l2. Attached to rod '10 is acontact piece O,v

which makes contact with a vfixed piece G 1 whenever electromagnet 3 is energized, that is to say, whenever signals are received by the radio receiving apparatus. Spring 11 causes armature 9, rod 10 and pawl l2 to return to their original position, and the connection between contacts O and O to be. broken, when electromagnet 8 is deenergized. Gr is a casing containing a gyroscope and any well-knownmechanism controlled thereby, which mechanism "is connected in any suitable manner With the bevel gearing C. The rotatable vertical rod or shaft D is attached to thebevel gearing C. Attached to the shaft D and turning with it is the double switch or commutator U,`hav ing an upper rim and aI lower rim, each rim having an insulated part and a conducting part. I is the insulated part and J the con ducting part1of the upper rim; I is the insulated part and .I the conducting part of the.lower rim. H and H" are fixed brushes bearing on the upper rim of commutator U, and H2 and H2 are fiXed brushes bearing on the lower rim of eommutator U. Battery B2, on the torpedo, or similar craft, is connected by the conductor Z with fixed contact piece O', and is connected by the conductor X2 with the lamps L and L on float F, and L2 and L3, on float F2. Brushes H and H2 are connected by means of conductor Z with movable contact O. Brush H, by means of conductor Y, is connected with lamps L and u2, and brush H2, by means of conductor Y, is connected with lamps L and L2. Mirf, rors M, M, M2 and M3 are attached to the floats F and F2, for the purpose of reflecting the light from lamps L, L, L2 and L2, respectively, as described lin connection with Figs/ and 72. N, N', N2 and N3 are lenses for the lights L, L, I2 and L3, respectively.

By means of the double switch or commu'tator U', and the brushes H, H', H2 and H2, also shown in Figs. 7, 8 and 9, the circuit through battery B2. and lamps L and L2 Vcan be completed and the lamps lighted only when the torpedo and the towed floats are moving away from the'observer at the vcontrolling station, and they will then be visible to this observer, but will be invisible to the enemy toward whom they are moving. The circuit through the battery B2 and the lamps L and L3 can be completed and the lamps lighted only when the torpedo and the floats are moving toward the controlling station, and they will then be visible to this statioinbut invisible to the enemy from whom they are moving away.

B v means of the contacts O and O", the

l lighting circuitswill be under the control of the observeiat the controlling station, and willbe closed only when impulses arek lsent and the electromagnet 8 is energized.

In this way, the lamps on the floats will be spectively.

predetermined positions of the torpedo, as above described. The guide lights on the floats, together with the guide light on the torpedo, or other towing craft, will enable the observer at the controlling station to direct the movements of the torpedo with great accuracy.

In Figs. 11 and 12, F is afloat carrying lamps L and L, f and f are two hulls, fastened together by pieces Q, Q, Q, N and N are lenses for lamps L and L', respectively, P isa horizontal screen for preventing the rays` from the lamps from striking the water and so betraying the presence of the floats and torpedo to the enemy, and P is a vertical screen between the-lampsso as vto prevent lamp L from sending its rays ahead, and to prevent lamp L from sending Aits rays astern.

In Fig. 13, a rotatable conducting arm 14 is mechanically connected with the gyroscope in casing G by means of the ring d, the rod or shaft D and the bevel gearing C, and so maintains a fixed azimuth when the gyrosco e is in operation. An outer ring or con ucting segments 16,17, 18 and 19 withA insulating segments 50, 51, 52 and 53, and an inner ring of conducting segments 36, 37, 38 and 39 with insulating segments 54, 55, 56 and 57, are fixed to the torpedo or other vessel and turn ,with it, the eonducting segments making contact successively, with the arm 14. The ring rl' is mechanf ically connected with the shaft D, but insulated therefrom, and is both electrically and mechanically connected with the arm 14. A. brush 15 bears against the ring al and is connected by means of theA conductor 35 with one pole of the battery or other source of current, B3, the other pole of whichis connected With one terminallof theelectromagnet 40, and also, 'by means of the insulated conductor or cable 20, with lights L, L1, Y L and L7 on one' towed float and with lights L2, L2, L8 and L9 on a second towed float. Insulated conductors 21, .22, 23, and 24,

preferably in the same cable withconductor 20, connect lights L, L, L2 and L3 with movable contacts 25, 26, -27 and 28, re- The movable contacts 25, 26, 27 and 28 are attached to a movable arm 43, but insulated therefrom, and the arm 43 is connected by means of the bar or rod 42 with the plunger 41 of, the electromagnet 40. One terminal of the electromagnet, as before mentioned, is connected with the battery B3, and the other terminal is connected with all four segments 16, 17, 18 and 19. The core or plunger 41 isconnected by the rod 44 with the piston 45, which travels in the cyl inder 47. Compression spring 46 opposes the movement of piston 45u and lunger 41 to the left, and restores them to t eir original position when the electromagnet is deenergzed. A pipe 48 connects the two ends of cylinder 47 and in said pipe is anadjustable valve 49 which permits air. to flow freely from-the right end to the left end of cylinder 47, but which retards the liow of air, to any degree desired, from the left end to the right end of the cylinder. The piston 45, ,plunger 41 and movable arm 43 will therefore move slowly `to the left when the electromagnet is energized, but. will move very quickly to the right when the electromagnet is denergized. i,

The ixedcontacts 29, 30, 31 and 32 are opposite the movable contacts 25,26, 27 and 28, respectively,but at increasing distances therefrom, as shown in the drawing Contacts 29 and 30 are connected, by means of conductor 33, :with segment 36, and contacts 30 and 32 arev connected, by means of conductor 34 with-segment 38. y f

The operation of this devi contact with 18, .the circuit through batter B3 and electromagnet 41 will be complete 35 the electromagnet will `be"energized2, the plunger 41 will be drawn slowly to the left,

and the arm 43 will likewise be drawn to the left, and contacts 25, 26, 27, and 28 will make contact, successively, 'with contacts 29,

30, v31 and 32. Contacts 29v and 31 being connected with segment-36, no circuit .will

be completed through them with rotatable arm 14 in its new position, but as contacts 30 and 32 arel connected with segment 38, 45 -circuits will be completed through them, arm 14, battery B3 and forward lights L and L3. It `will be seen, however, that the circuit through contact 30 and light L', on the first float, will be completed before the circuit through contact 32 and light L3, on the second float. 'By this arrangement, when the torpedo turns, and the gyroscope-cont'rolled arm 14 makes contact for the forward light circuits, enough time elapses before these circuits are completed to' allow each float, in order, to turn far enough before its lamp is lighted, to prevent its light from being visible to the enemy.

When the rotatable arm 14 reaches conducting segment36, the stern lights L and L2 will be lighted in succession by means of the vmovable contacts 25 and 27 and xed contacts 29 and '31.

The lights L and-L2 are stern lights, L

A ce -is as`follows: The rotatable arm 14 is shown on the and Lr$` are forward lights, L6 and L" are starboard lights, and L7 and L9 are port lights. These starboard and port lights mav be connected through movable contacts simi- Vlar to 25, 26, 27 and 28, or otherwise, with 70 segments 39 and 37,.'respectively, but the cir cuits are not shown, in order to avoid vconfusion.

If starboard and port lights areused, they should' be suitably screened so as to limit 75 their arc of illumination, as is the case with the bow and stern lights also.

By the means described, whether the bow lights, stern lights or side lights, the light on thev iirst float is lighted first, the light on the second float next, and so on, so that amy ple time is given for the floats to turn and get in line with the torpedo 0r other towing Vvessel before the lights are lighted, and so avoid betraying their presence to the enemy. 85

The electromagnet or solenoid 40 may be made to operatewith any desired speed, and this speed should be regulated according to the' turning radius and speed of the torpedo. The resistance of the electromagnet, when it is in a shunt circuit to the lighting circuit, as shown, should be such that ample current will flow through the lights on the Heats. The electromagnet may, however, vbe in an entirely independent circuit, with a separate battery or other source of current.

The gyroscope in casing 4G is set so that when it is in operation it will hold the -light K in-such a position that its rays are directed toward the controlling station.

I may-use any convenient number of floats, and the floats may be constructedand arranged in any suitable manner; The lights on my torpedo and on my fioats are preferably electric incandescent lamps, ut any other suitable lights may be used. The switches'or commutators 'and other details of the apparatusmay be altered as found suitable in any given case, and, in general,

I do not confine myself to the particular apparatus `and mechanisms here shown, but various changes and modifications, within the knowledge of those skilled in the art, may be made in the particular apparatus shown and described herein, without departing from the spirit of my invention. provided the meansv set forth in the following claims be employed.

. Having thus described my invention, what I claim is:'

1. A system of guides for `a vessel and a float or floats towed thereby, comprising a guide on the vessel, means to direct theguide in a fixed direction, a guide on each float, and means to control said float guideor 125 `guides to allow the same'to act as guides only when the float carrying such guide is pointed in a predetermined direction.

2. A system of guides for a .vessel and a float or floats towed'thereby, comprising a 130V vsel and a ioat or ing in one direction guide on the vessel, means to direct the guide in a fixed direction, a guide on each float, and means to control said float guide or guides to allow the same to act as guides only when said vessel is pointed in a predetermined direction. y

3. A system of guides for a vessel and float or floats towed thereby, comprising a guide light on the vessel, means to direct the said light in a fixed direction, 4a source 0f light on each iioat, and means to control said source of light to allow the same to emit light only when the float carrying the light is pointed in a predetermined direc tion.

4. A system of guidelights for a vessel and towed thereby,

t in a fixed direction, a source of light on each float, and means to control Vsaid source of light to allow the same to emit light only when the vessel is pointed in a predetermined direction.

5. A system of distance control for a vessel and a float or floats towed thereby, comprising a gyroscope to maintain a fixed azimuth, a guldelight on the vessel controlled by said gyroscope, and a source of light on each float controlled kby said gyroscope.

6; A system of distance control for a vesiioats towed thereby comprising a gyroscope which maintains a iiXed azimuth, a guide on said vessel controlled by said gyroscope and a guide upon each float controlled by said gyroscope. v

A system of distance control for vesl sels and a float or floats towed thereby comprising receiving apparatus for radiant energy upon said vessel, a source of light on said vessel, and means to direct said light in a fixed direction, a source of light on each float, and means for causing said sources of light to emit light only when radiant energy is received by said receiving apparatus.

8. A system of guidelights for vessels and a float or floats towed thereby comprising a gyroscope upon said vessel which maintains a fixed azimuth, a source of light on said vessel controlled by said gyroscope, a switch controlled by said gyroscope, la source of electric current, and lamps carried by said floats electrically of current and said switch.

9. A system ofguidel'ights for a vessel and a float or iioats towed thereby comprising a -guidelight on said vessel, means to direct said light in a fixed direction, a forward lamp and a rear lamp` upon each float, and means for causing said forward lamps to be lighted when the vessel is mov and said rear lights to be lighted when the vessel is moving in the opposite direction.

10. A system of guidelights for a vessel and a ioat or iioats towed thereby comdirection, sources comprising the vessel means to direct connected with said source prising a guidelight on said vessel, automatically actua te means toV direct said light in a fixed direction, a source of light on each float and aswitch on said vessel operated by said automatic means for controlling the lights on said floats.

ll. -In a system of guidelights for a vessel and aV float or float-s -towed thereby comprising a guidelight on said vessel, receiving apparatus for radiant energy on said vessel, and means to direct said light in a fixed of light on each float, and means for causing, the lights on the floats to bel lighted successively `beginning with that on'the lat nearest the towing vessel.

152.l A system of guides' for a vessel and a loat`orloats towed' thereby comprising a receiving apparatus for radiant energy on said vessel, a guide on said vessel, means for automatically causingsaid guide to function in a fixed direction, a guide upon each iioat, and means for causing the guides on the oats to function successively beginning with that on the float nearest'the towing vessel.

13. A System of guidelights for a vessel and a float or floats towed thereby comprising a guidelight on the vessel, automatic means to direct said light in a fixed direction, a source of light on such float, and means for causing said lights to be lighted in succession.

14E. A system of distance control for a vessel and a float or iioats towed thereby comprisinga guide on said vessel, automatic means for causing said guide to function in a fixed direction, a guide on each float, and means for causing said float guides to func-l tion in succession. l

15. A system of guidelights for a vessel and a float or iioats towed thereby comprising a light upon eachiioat, and automatic means on said vessel for lighting said lights, and means for causing said lights to be lighted successively, beginning with that on the float nearest the vessel.

16. Asystem of guides for a vessel and a oat or floats towed thereby comprising a guide upon each float and automatic means upon Said vessel for causing said guides to function successively, beginning with that on the float nearest the vessel.

17 A system of control comprising a main movable body, a subsidiary body movable with respect to said main body, a main element mounted on said main'body and movabie with respect thereto, and a subsidiary element mounted on said subsidiary body and controlled by said main element, one of said elements being automatically operative direction maintaining means.

18. A system of control comprising a main movable body, a subsidiary body movable with respect to ,said main body, a main element mounted on said main body and movable with .respect thereto, and a subsidiary element mounted on said subsidiaryy body and controlled by said main element, one of said elements being a gyroscope.

19. A system of control comprising a main movable body, a .subsidiary body-movi ble with respect to said main body, a gyroscope mounted on said main bodyl and movable with respect thereto, anda subsidiary element mounted on said subsidiary body and controlled by said gyroscope.

20. A system of control comprising a main dirigible body,l a subsidiary dirigible body movable with respect to said main body, a main element carried by said main body and movable with respect thereto, and a subsidiary element carriedl by said subsidiary body and controlled by saidinain element, one of said elements being automatically operative direction maintaining means.

21. A system of control comprising a main dirigible body, a subsidiary dirigible body movable vwith respect to said main body, automatically operative direction maintaining means 'carried by said main body and movable With respect thereto, and asubsidiary element carried by said subsidiary body and controlled by said means.

22. A system of controlgcomprising a main dirigible body, a subsidiary dirigible body movable With respect to said main body, a

gyroscope carried by said main body and movable With respect thereto, and a subsidiary-element carried by said subsidiary body and controlled by said gyroscope. y

23. A system of control comprising a main diri'gible marine vessel, a subsidiary dirigible Vmarine vessel movable with respect to said main vessel, a main element carried by said main 'vessel and movable with respect thereto, and a subsidiary element carried by said subsidiary ve's'sel and controlled by said main element, one of said elements being automatically operative direction maintainiig means. 4

24. A system of control comprising a main dirigible marine vessel, a subsidiary dirigible marine vessel 'movable with respect to said main vessel, a main element carried by said main vessel and movableWith respect thereto, and a subsidiary element carried by said subsidiary vessel and controlled by said main element, one of said elements being a gyroscope.

25. A system of control comprising a main` dirigible marine vessel, a subsidiary dirigible marine vessel movable With respect to said main vessel, automatically operative direction maintaining means carried by said 60` main vessel and movable With respect thereto, and a subsidiary Aelement carried by said subsidiary vessel and controlled by said means. 4

26. A system of control comprising a main dirigible marine vessel, a subsidiary dirigi= to be moved by .and in unison with said mam body and movable with respect thereto, a main element mounted on said main body and movable -With respect thereto, and a subsidiary element mounted on said subsidiary body and controlled by said main element, one `of said elements being automatically operative direction maintaining means.

28. A system of control comprising a main movable body, a subsidiary body arranged to be moved by and-'in unison with said mainbody and movable with respect thereto, a gyroscope mounted on said main body and movable With respect thereto, and a subsidiary element-mounted on saidlsubsidiary body and controlled by, said gyroscope.

29. Asystemof control comprising a main dirigible body, a subsidiary body movable .vith respect to said main body, a gyroscope carried by said main body and movable with respect thereto, and a subsidiary element carried by said subsidiary body and controlled by said gyroscope."

3Q. A system of position revealing devices for a main inovableybody and one or more subsidiary movable bodies towed by said main body, comprising a position revealing device on said main body, stabilizing means to direct-said position revealing device in a fixed direction, the position revealing device on each of said subsidiary bodies,'and means controlled bysaid stabilizing means tov cause l 31. A system for revealing the position of a main movable body and a subsidiary Innvable body, comprising a position revealing device upon said main body, stabilizing means arranged to cotrol the functioning of said position revealing device, and a position revealing device 'upon said subsidiary body and arranged to be controlled by said stabilizing means. .y l

32. 5A system for revealing the position of a plurality of ,separately movable bodies, comprising 'a position revealing device mounted on each of said bodies, and stabilizing means carried by Aone of said bodies and arranged'to control the .functioning of said position vrevealing devices.

33. A system for revealing the position of a plurality of separately movable bodies, comprising a position revealing lamp arranged to control the functioning of said position revealing lamps.

34. A system for revealing the position of a plurality of separately movable bodies, comprising a position revealing device mounted on each of said bodies, and stabilizing means carriedl by one of said bodies and arranged to control the functioning of said position revealing devices and to cause each one of said position revealing devices to function as such only when the corresponding movable body is directed along a predetermined line.

35. A system for revealing the position of a plurality of separately movable bodies,

comprising a position revealing lamp mounted on each of said bodies, and stabilizing means carried by one of 'said bodies and arranged to control the functioning of said position revealing lamps and to cause one of said lights to be illuminated only when the corresponding body is directed along a predetermined line.

This specification signed and witnessed thislltli day of August, A. D., 1913.

JOHN HAYs HAMMQND, JR.

Signed in the presence of` FITz J. BAsoN, JOHN CUNNINGHAM. 

